[Tracking] can't see all files status in codecov.io, includes the entire folder: System.Windows.Forms

[Olina-Zhang]

In the [codecov.io](https://app.codecov.io/gh/dotnet/winforms/tree/main/src%2FSystem.Windows.Forms%2FSystem%2FWindows%2FForms), we cannot get the code coverage for all controls source file, it's empty.

There is missing System.Windows.Forms folder under the entire src folder: https://app.codecov.io/gh/dotnet/winforms/tree/main/src

[LeafShi1]

This issue also appears in PR #13489 (comment)

[LeafShi1]

Everything is back to normal